Sharply twinned Montebrasite in tabular crystals with pale yellow color 2,0 cm tall on matrix. Montebrasite is a rare Li-Al phosphate found in granite pegmatites . The world's finest examples come from Minas Gerais and this is a really nice example for the specie. Ex Dr. Francesco Bedognè coll. with label.
Formula :
LiAl[(OH,F)/PO4]
System: triclinic Hardness:5½-6 Rarity:rare
Strunz id:VII/B.2-40 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: Named by Alfred Des Cloizeaux in 1871 for the type locality, the Montebras Mine, Montebras-en-Soumans, Boussac, Creuse, Limousin, France. [Previous attempts by Des Cloizeaux to name montebrasite were rejected as his analyses indicated he had specimens in the amblygonite portion of the F-OH series (King and Foord, 1994).]
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 Specimen weight:10 gr.
 Crystal size:2,0 cm tall
 Overall size: 28mm x 15 mm x 20 mm
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